From 1c301f9f7ab8bf00d04331acc26b5195820ed1cf Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Mon, 25 Mar 2019 17:12:10 +0000
Subject: [PATCH] drive: Fix creation of duplicates with server side copy -
 fixes #3067

---
 backend/drive/drive.go | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/backend/drive/drive.go b/backend/drive/drive.go
index 652c6b084..032e126fb 100644
--- a/backend/drive/drive.go
+++ b/backend/drive/drive.go
@@ -1872,6 +1872,9 @@ func (f *Fs) Copy(src fs.Object, remote string) (fs.Object, error) {
 		remote = remote[:len(remote)-len(ext)]
 	}
 
+	// Look to see if there is an existing object
+	existingObject, _ := f.NewObject(remote)
+
 	createInfo, err := f.createFileInfo(remote, src.ModTime())
 	if err != nil {
 		return nil, err
@@ -1889,7 +1892,17 @@ func (f *Fs) Copy(src fs.Object, remote string) (fs.Object, error) {
 	if err != nil {
 		return nil, err
 	}
-	return f.newObjectWithInfo(remote, info)
+	newObject, err := f.newObjectWithInfo(remote, info)
+	if err != nil {
+		return nil, err
+	}
+	if existingObject != nil {
+		err = existingObject.Remove()
+		if err != nil {
+			fs.Errorf(existingObject, "Failed to remove existing object after copy: %v", err)
+		}
+	}
+	return newObject, nil
 }
 
 // Purge deletes all the files and the container